Radio frequency allocation among wireless user equipment and integrated access and backhaul mobile terminations

ABSTRACT

A wireless access node serves wireless User Equipment (UEs) and wireless Integrated Access and Backhaul Mobile Terminations (IAB MTs). A radio exchanges access communications with the UEs over a frequency channel. The radio receives an IAB request from one of the IAB MTs, and in response, a controller allocates the frequency channel into a UE subchannel and an MT subchannel. The radio now exchanges access communications with the UEs over the UE subchannel and exchanges backhaul communications with the wireless IAB MT over the MT subchannel. The controller reallocates the frequency channel when an IAB MT is added to give the new IAB MT its own MT subchannel. The controller reallocates the frequency channel when an IAB MT is removed to increase the size of the UE subchannel.

TECHNICAL BACKGROUND

Wireless communication networks provide wireless data services towireless user devices. Exemplary wireless data services includemachine-control, internet-access, media-streaming, andsocial-networking. Exemplary wireless user devices comprise phones,computers, vehicles, robots, and sensors. The wireless user devicesexecute user applications to support and use the wireless data services.For example, a smartphone may execute a social-networking applicationthat communicates with a content server over a wireless communicationnetwork.

The wireless communication networks have wireless access nodes whichexchange wireless signals with the wireless user devices over radiofrequency bands. The wireless signals use wireless network protocolslike Fifth Generation New Radio (5GNR), Long Term Evolution (LTE),Institute of Electrical and Electronic Engineers (IEEE) 802.11 (WIFI),and Low-Power Wide Area Network (LP-WAN). The wireless access nodesexchange network signaling and user data with network elements that areoften clustered together into wireless network cores. The networkelements comprise Access and Mobility Management Functions (AMFs),Session Management Functions (SMFs), User Plane Functions (UPFs), andthe like.

The wireless access nodes comprise Radio Units (RUs), Distributed Units(DUs), and Centralized Units (CUs). The wireless user devices wirelesslycommunicate with the RUs which are often mounted on towers. The RUscommunicate with nearby DUs over fronthaul links. The DUs communicatewith the CUs over mid-haul links. The CUs communicate with the wirelessnetwork cores over the backhaul links.

The mid-haul links that couple the DUs and CUs typically comprisewireline links like glass fibers or metal wires. The mid-haul links mayalso comprise wireless links like point-to-point microwave channels orIntegrated Access and Backhaul (IAB) connections. For IAB, the DUs areequipped with IAB Mobile Terminations (MTs) which are essentiallywireless user devices that have been adapted to serve DUs. The DUs andCUs are equipped with IAB donor components which are essentiallybaseband units for the IAB MTs.

Unfortunately, the RUs, DUs, and CUs ineffectively use frequencychannels when implementing IAB backhaul. Moreover, the CUs do notefficiently manage the allocation of the frequency channels among theUEs and the IAB MTs.

TECHNICAL OVERVIEW

A wireless access node serves wireless User Equipment (UEs) and wirelessIntegrated Access and Backhaul Mobile Terminations (IAB MTs). A radioexchanges access communications with the UEs over a frequency channel.The radio receives an IAB request from one of the IAB MTs, and inresponse, a controller allocates the frequency channel into a UEsubchannel and an MT subchannel. The radio now exchanges accesscommunications with the UEs over the UE subchannel and exchangesbackhaul communications with the wireless IAB MT over the MT subchannel.The controller reallocates the frequency channel when an IAB MT is addedto give the new IAB MT its own MT subchannel. The controller reallocatesthe frequency channel when an IAB MT is removed to increase the size ofthe UE subchannel.

DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a wireless communication network that comprises awireless access node which allocates frequency channels among wirelessUser Equipment (UEs) and wireless Integrated Access and Backhaul MobileTerminations (IAB MTs).

FIG. 2 illustrates an exemplary operation of the wireless access node toallocate the frequency channels among the wireless UEs and wireless IABMTs.

FIG. 3 illustrates an exemplary operation of the wireless access node toallocate the frequency channels among the wireless UEs and wireless IABMTs.

FIG. 4 illustrates a Fifth Generation (5G) communication network thatcomprises Radio Units (RUs), Distributed Units (DUs), and a CentralizedUnit (CU) to allocate frequency channels among wireless UEs and wirelessIAB MTs.

FIG. 5 illustrates a wireless UE in the 5G wireless communicationnetwork.

FIG. 6 illustrates an IAB donor in the 5G wireless communicationnetwork.

FIG. 7 illustrates an IAB MT in the 5G wireless communication network.

FIG. 8 illustrates an exemplary frequency channel allocation into a UEsubchannel and IAB MT subchannels.

FIG. 9 illustrates an exemplary control-plane operation of the 5Gwireless communication network to allocate the frequency channels amongthe wireless UEs and the wireless IAB MTs.

FIG. 10 illustrates an exemplary user-plane operation of the 5G wirelesscommunication network to allocate the frequency channels among thewireless UEs and the wireless IAB MTs.

DETAILED DESCRIPTION

FIG. 1 illustrates wireless communication network 100 that compriseswireless access node 110 that allocates a frequency channel amongwireless User Equipment (UEs) 101-103 and wireless Integrated Access andBackhaul Mobile Terminations (IAB MTs) 141-142. Wireless communicationnetwork 100 comprises User Equipment (UEs) 101-103, radios 111-113,controllers (CNT) 121-123, and IAB MTs 141-142. Wireless communicationnetwork 100 delivers services to UEs 101-103 like internet-access,machine-control, media-streaming, or some other data communicationsproduct. UEs 101-103 comprise computers, phones, vehicles, sensors,robots, or some other data appliances with wireless communicationcircuitry.

Various examples of network operation and configuration are describedherein. In some examples, wireless UEs 101-103 wirelessly exchangeaccess communications with respective radios 111-113 over wireless links131-133. Wireless links 131-133 occupy the frequency channel. Radios111-113 and respective controllers 121-123 exchange their accesscommunications over fronthaul links. Controllers 122-123 exchange theiraccess communications with controller 121 over midhaul links. Controller121 exchanges the access communications with a network core or someother data system over backhaul links.

Controller 122 transfers an IAB access request to IAB MT 141—possibly inresponse to poor performance of the mid-haul links between controllers121-122. IAB MT 141 wirelessly transfers a corresponding IAB request tocontroller 121 over wireless link 134 and radio 111. In response to theIAB request, controller 121 allocates the frequency channel into a UEsubchannel and an MT subchannel. A subchannel typically comprises agroup of adjacent resource blocks in the frequency channel. Controller121 directs controller 122 to use the MT subchannel and directscontroller 123 to use the UE subchannel. Controller 121 directs radio111 to use the UE subchannel for UEs 101 and to use the MT subchannelfor IAB MT 141. Controller 122 directs radio 112 to use the MTsubchannel for UEs 102. Controller 123 directs radio 113 to use the UEsubchannel for UEs 103. UEs 101 wirelessly exchange accesscommunications with radio 111 over wireless links 131 which occupy theUE subchannel. UEs 102 wirelessly exchange access communications withradio 112 over wireless links 132 which occupy the MT subchannel. UEs103 wirelessly exchange access communications with radio 113 overwireless links 133 which occupy the UE subchannel. Radios 111-113 andrespective controllers 121-123 exchange their access communications overthe fronthaul links. Controller 122 exchanges its access communicationswith controller 121 over IAB MT 141, wireless link 134 in the MTsubchannel, radio 111, and the fronthaul link to controller 121.Controller 123 exchanges its access communications with controller 121over the midhaul links. Controller 121 exchanges the accesscommunications with the network core or other data systems over thebackhaul links. The subchannels in this paragraph significantly reducethe interference between UEs 101 and IAB MT 141, between UEs 103 and IABMT 141, between UEs 101 and UEs 102, and between UEs 102 and UEs 103.

In some examples when controller 122 is using IAB MT 141 for midhaul,controller 123 transfers another IAB access request to IAB MT142—possibly in response to poor performance over the mid-haul linksbetween controllers 121 and 123. IAB MT 142 wirelessly transfers acorresponding IAB request to controller 121 over wireless link 135 andradio 111. In response to this IAB request, controller 121 allocates thefrequency channel into a new UE subchannel, a first MT subchannel, and asecond MT subchannel. Controller 121 directs controller 122 to use thefirst MT subchannel and directs controller 123 to use the second MTsubchannel. Controller 121 directs radio 111 to use the new UEsubchannel for UEs 101, the first MT subchannel for IAB MT 141, and thesecond MT subchannel for IAB MT 142. Controller 122 directs radio 112 touse the first MT subchannel for UEs 102. Controller 123 directs radio113 to use the second MT subchannel for UEs 103. UEs 101 wirelesslyexchange access communications with radio 111 over wireless links 131which occupy the new UE subchannel. UEs 102 wirelessly exchange accesscommunications with radio 112 over wireless links 132 which occupy thefirst MT subchannel. UEs 103 wirelessly exchange access communicationswith radio 113 over wireless links 133 which occupy the second MTsubchannel. Radios 111-113 and respective controllers 121-123 exchangetheir access communications over the fronthaul links. Controller 122exchanges its access communications with controller 121 over IAB MT 141,wireless link 134 in the first MT subchannel, radio 111, and thefronthaul link to controller 121. Controller 123 exchanges its accesscommunications with controller 121 over IAB MT 142, wireless link 135 inthe second MT subchannel, radio 111, and the fronthaul link tocontroller 121. Controller 121 exchanges the access communications withthe network core or other data systems over the backhaul links. Thesubchannels in this paragraph significantly reduce the interferencebetween UEs 101, IAB MT 141, and IAB MT 142 and between UEs 101, UEs102, and UEs 103.

In some examples when controllers 122-123 are using IAB MTs 141-142 formidhaul, controller 123 transfers an IAB deregistration to IAB MT142—possibly in response to a performance improvement over the mid-haullinks between controllers 121 and 123. IAB MT 142 wirelessly transfers acorresponding IAB deregistration to controller 121 over wireless link135 and radio 111. In response to the IAB deregistration, controller 121reallocates the frequency channel into a new UE subchannel and a new MTsubchannel. Controller 121 directs controller 122 to use the new MTsubchannel and directs controller 123 to use the new UE subchannel.Controller 121 directs radio 111 to use the new UE subchannel for UEs101 and to use the new MT subchannel for IAB MT 141. Controller 122directs radio 112 to use the new MT subchannel for UEs 102. Controller123 directs radio 113 to use the new UE subchannel for UEs 103. UEs 101wirelessly exchange access communications with radio 111 over wirelesslinks 131 in the new UE subchannel. UEs 102 wirelessly exchange accesscommunications with radio 112 over wireless links 132 in the new MTsubchannel. UEs 103 wirelessly exchange access communications with radio113 over wireless links 133 in the new UE subchannel. Radios 111-113 andrespective controllers 121-123 exchange their access communications overthe fronthaul links. Controller 122 exchanges its access communicationswith controller 121 over IAB MT 141, wireless link 134 in the new MTsubchannel, radio 111, and the fronthaul link to controller 121.Controller 123 exchanges its access communications with controller 121over the midhaul links. Controller 121 exchanges the accesscommunications with the network core or other data systems over thebackhaul links. The subchannels in this paragraph significantly reducethe interference between UEs 101 and IAB MT 141, between UEs 103 and IABMT 141, between UEs 101 and UEs 102, and between UEs 102 and UEs 103.

In some examples and when controller 122 is using IAB MT 441 formidhaul, but controller 123 is not using IAB MT 442 for midhaul,controller 122 transfers an IAB deregistration to IAB MT 141—possibly inresponse to a performance improvement over the mid-haul links betweencontrollers 121-122. IAB MT 141 wirelessly transfers a corresponding IABderegistration to controller 122 over wireless link 134 and radio 111.In response to the IAB deregistration, controller 121 deallocates theremaining MT subchannel, and the UE subchannel uses the entire frequencychannel. Controller 121 directs controllers 122-123 to use the entirefrequency channel. Controllers 121-123 direct radios 111-113 to use theentire frequency channel for UEs 101-103. UEs 101-103 wirelesslyexchange access communications with radios 111-113 over wireless links131-133 which may now use frequencies across the entire frequencychannel. Radios 111-113 and controllers 121-123 exchange the accesscommunications over the fronthaul links. Controllers 122-123 exchangetheir access communications with controller 121 over the midhaul links.Controller 121 exchanges the access communications with the network coreor other data systems over the backhaul links.

Advantageously, radios 111-113 and controllers 121-123 effectively usethe frequency channel when implementing IAB backhaul. Moreover,controller 121 efficiently manages the allocation of the frequencychannel among UEs 101-103 and IAB MTs 141-142.

UEs 101-103 and IAB MTs 141-142 communicate with wireless access nodes111-113 over technologies like Fifth Generation New Radio (5GNR), LongTerm Evolution (LTE), Institute of Electrical and Electronic Engineers(IEEE) 802.11 (WIFI), LP-WAN or some other wireless protocol. Thewireless communication technologies use electromagnetic frequencies inthe low-band, mid-band, high-band, or some other portion of theelectromagnetic spectrum. The fronthaul, midhaul, and backhaul links usemetallic links, glass fibers, radio channels, or some othercommunication media. The fronthaul, midhaul, and backhaul links useInstitute of Electrical and Electronic Engineers (IEEE) 802.3(Ethernet), WIFI, Ethernet, IP, Time Division Multiplex (TDM), Data OverCable System Interface Specification (DOCSIS), General Packet RadioService Transfer Protocol (GTP), 5GNR, LTE, WIFI, virtual switching,inter-processor communication, bus interfaces, and/or some other datacommunication protocols.

UEs 101-103, IAB MTs 141-142, and radios 111-113 comprise antennas,amplifiers, filters, modulation, analog/digital interfaces,microprocessors, software, memories, transceivers, bus circuitry, andthe like. Controllers 121-123 comprise microprocessors, software,memories, transceivers, bus circuitry, and the like. The microprocessorscomprise Digital Signal Processors (DSP), Central Processing Units(CPU), Graphical Processing Units (GPU), Application-Specific IntegratedCircuits (ASIC), and/or the like. The memories comprise Random AccessMemory (RAM), flash circuitry, disk drives, and/or the like. Thememories store software like operating systems, user applications, radioapplications, and network functions. The microprocessors retrieve thesoftware from the memories and execute the software to drive theoperation of wireless communication network 100 as described herein.

FIG. 2 illustrates an exemplary operation of wireless access node 110 toallocate the frequency channels among wireless UEs 101-103 and wirelessIAB MTs 141-142. The operation may vary in other examples. Radio 111wirelessly exchanges first access communications with the wireless UEs101 over a frequency channel (201). Radio 111 wirelessly receives an IABrequest from wireless IAB MT 141 (202). Controller 121 allocates thefrequency channel into a UE subchannel and an MT subchannel responsiveto the IAB request (203). Radio 111 wirelessly exchanges accesscommunications with wireless UEs 101 over the UE subchannel (204). Radio111 wirelessly exchanges midhaul communications with wireless IAB MT 141over the MT subchannel (205). Radio 111 wirelessly receives another IABrequest from wireless IAB MT 142 (206). Controller 121 reallocates thefrequency channel into a new UE subchannel, a first MT subchannel, and asecond MT subchannel (207). Radio 111 wirelessly exchanges accesscommunications with wireless UEs 101 over the new UE subchannel (208).Radio 111 wirelessly exchanges midhaul communications with wireless IABMT 141 over the first MT subchannel (209). Radio 111 wirelesslyexchanges midhaul communications with the wireless IAB MT 142 over thesecond MT subchannel (210).

FIG. 3 illustrates an exemplary operation of wireless access node 110 toallocate the frequency channels among wireless UEs 101-103 and wirelessIAB MTs 141-142. The operation may vary in other examples. UEs 101-103and respective radios 111-113 wirelessly exchange user data over thefrequency channel. Radios 111-113 and respective controllers 121-123exchange the user data. Controllers 122-123 exchange the user data withcontroller 121. Controller 121 exchanges the user data over the backhaullinks.

Controller 122 transfers an IAB access request to IAB MT 141. IAB MT 141wirelessly transfers a corresponding IAB request to controller 121 overradio 111. In response to the IAB request, controller 121 allocates thefrequency channel into a UE subchannel and an MT subchannel. Controller121 directs radio 111 to use the UE subchannel for UEs 101 and the MTsubchannel for IAB MT 141. Controller 121 directs controller 122 to usethe MT subchannel and directs controller 123 to use the UE subchannel.Controller 122 directs radio 112 to use the MT subchannel for UEs 102.Controller 123 directs radio 113 to use the UE subchannel for UEs 103.

UEs 101 wirelessly exchange user data with radio 111 over wireless links131 which occupy the UE subchannel. UEs 102 wirelessly exchange userdata with radio 112 over wireless links 132 which occupy the MTsubchannel. UEs 103 wirelessly exchange user data with radio 113 overwireless links 133 which occupy the UE subchannel. Radios 111-113 andrespective controllers 121-123 exchange their user data over thefronthaul links. Controller 122 exchanges its user data with controller121 over IAB MT 141, wireless link 134 in the MT subchannel, radio 111,and the fronthaul link to controller 121. Controller 123 exchanges itsuser data with controller 121 over the midhaul links. Controller 121exchanges the user data with the network core or other data systems overthe backhaul links.

When controller 122 is still using IAB MT 141 for midhaul, controller123 transfers an IAB access request to IAB MT 142. IAB MT 142 wirelesslytransfers a corresponding IAB request to controller 121 over wirelesslink 135 and radio 111. In response to this IAB request, controller 121allocates the frequency channel into a new UE subchannel, a first MTsubchannel, and a second MT subchannel. Controller 121 directs radio 111to use the new UE subchannel for UEs 101, the first MT subchannel forIAB MT 141, and the second MT subchannel for IAB MT 142. Controller 121directs controller 122 to use the first MT subchannel and directscontroller 123 to use the second MT subchannel. Controller 122 directsradio 112 to use the first MT subchannel for UEs 102. Controller 123directs radio 113 to use the second UE subchannel for UEs 103.

UEs 101 wirelessly exchange user data with radio 111 over wireless links131 in the new UE subchannel. UEs 102 wirelessly exchange user data withradio 112 over wireless links 132 in the first MT subchannel. UEs 103wirelessly exchange user data with radio 113 over wireless links 133 inthe second MT subchannel. Radios 111-113 and respective controllers121-123 exchange their user data over the fronthaul links. Controller122 exchanges its user data with controller 121 over IAB MT 141,wireless link 134 in the first MT subchannel, radio 111, and thefronthaul link to controller 121. Controller 123 exchanges its user datawith controller 121 over IAB MT 142, wireless link 135 in the second MTsubchannel, radio 111, and the fronthaul link to controller 121.Controller 121 exchanges the access communications with the network coreand/or other data systems over the backhaul links.

When controllers 122-123 are using IAB MTs 141-142 for midhaul,controller 123 transfers an IAB deregistration to IAB MT 142. IAB MT 142wirelessly transfers a corresponding IAB deregistration to controller121 over wireless link 135, radio 111, and the fronthaul link tocontroller 121. In response to the IAB deregistration, controller 121allocates the frequency channel back into the UE subchannel and the MTsubchannel as described above. If controller 121 then receives an IABderegistration for IAB MT 141, controller 121 deallocates the remainingfrequency channel and the entire frequency channel is again used by eachof controllers 121-123.

FIG. 4 illustrates a Fifth Generation (5G) communication network 400that comprises Radio Units (RUs) 411-413, Distributed Units (DUs)421-423, and Centralized Unit (CU) 431 to allocate a frequency channelamong wireless UEs 401-403 and wireless IAB MTs 441-442. 5G wirelesscommunication network 400 comprises an example of wireless communicationnetwork 100, although network 100 may vary from this example. 5Gwireless communication network 400 comprises: UEs 401-403, RUs 411-413,DUs 421-423, CU 431, IAB MTs 441-442, Access and Mobility ManagementFunctions (AMF) 451, Session Management Function (SMF) 452, and UserPlane Function (UPF) 453. RU 411, DU 421, and CU 431 comprise IAB donor440. RUs 411-413 comprise examples of radios 111-113, although radios111-113 may differ. DUs 421-423 and CU 431 comprise examples ofcontrollers 121-123, although controllers 121-123 may differ.

UEs 401 attach to CU 431 over a frequency channel, RU 411, and DU 421.CU 431 registers UEs 401 with AMF 451. CU 431 and UEs 401 establish datapaths over the frequency channel, RU 411, and DU 421. CU 431, AMF 451,and SMF 452 establish corresponding data paths between CU 431 and UPF453. UEs 401 communicate with external systems over the frequencychannel, RU 411, DU 421, CU 431, and UPF 453. UEs 402 attach to CU 431over the frequency channel, RU 412, and DU 422. CU 431 registers UEs 402with AMF 451. CU 431 and UEs 402 establish data paths over the frequencychannel, RU 412 and DU 422. CU 431, AMF 451, and SMF 452 establishcorresponding data paths between CU 431 and UPF 453. UEs 402 communicatewith external systems over the frequency channel, RU 412, DU 422, CU431, and UPF 453. UEs 403 attach to CU 431 over the frequency channel,RU 413, and DU 423. CU 431 registers UEs 403 with AMF 451. CU 431 andUEs 403 establish data paths over the frequency channel, RU 413 and DU423. CU 431, AMF 451, and SMF 452 establish corresponding data pathsbetween CU 431 and UPF 453. UEs 403 communicate with external systemsover the frequency channel, RU 413, DU 423, CU 431, and UPF 453.

When the performance of the midhaul link between DU 422 and CU 431falters, DU 422 requests an IAB link to CU 431 from IAB MT 441. IAB MT441 attaches to CU 431 over RU 411 and DU 421. DU 422 connects with CU431 over IAB MT 441, RU 411, and DU 421. In response to the IAB link, CU431 allocates the frequency channel into a UE subchannel for UEs 401 and403 and an MT subchannel for IAB MT 441 and UEs 402. CU 431 directs RU411 to use the UE subchannel for UEs 401 and to use the MT subchannelfor IAB MT 441. CU 431 directs DU 422 to use the MT subchannel for UEs402. CU 431 directs DU 423 to use the UE subchannel for UEs 403. UEs 401communicate with external systems over the UE subchannel, RU 411, DU421, CU 431, and UPF 453. UEs 402 communicate with external systems overthe MT subchannel, RU 412, DU 422, IAB MT 441, DU 421, CU 431, and UPF453. UEs 403 communicate with external systems over the UE subchannel,RU 413, DU 423, CU 431, and UPF 453. The subchannels in this paragraphmitigate interference between 1) UEs 401 and IAB MT 441, 2) UEs 403 andIAB MT 441, 3) UEs 401 and UEs 402, and 4) UEs 402 and UEs 403. IAB MT441 and DU 422 communicate to mitigate interference in the MT subchannelbetween IAB MT 441 and UEs 402. DUs 421 and 423 communicate to mitigateinterference in the UE subchannel between UEs 401 and UEs 403.

When the performance of the midhaul link between DU 423 and CU 431falters and DU 422 is already using IAB MT 441, DU 423 requests an IABlink to CU 431 from IAB MT 442. IAB MT 442 attaches to CU 431 over RU411 and DU 421. DU 423 connects with CU 431 over IAB MT 442, RU 411, andDU 421. In response to the IAB link, CU 431 allocates the frequencychannel into a UE subchannel for UEs 401, a first MT subchannel for IABMT 441 and UEs 402, and a second MT subchannel for IAB MT 442 and UEs403. CU 431 directs RU 411 to use the UE subchannel for UEs 401, to usethe first MT subchannel for IAB MT 441, and to use the second MTsubchannel for IAB MT 442. CU 431 directs DU 422 to use the first MTsubchannel for UEs 402. CU 431 directs DU 423 to use the second MTsubchannel for UEs 403. UEs 401 communicate with external systems overthe UE subchannel, RU 411, DU 421, CU 431, and UPF 453. UEs 402communicate with external systems over the first MT subchannel, RU 412,DU 422, IAB MT 441, RU 411, DU 421, CU 431, and UPF 453. UEs 403communicate with external systems over the second MT subchannel, RU 413,DU 423, IAB MT 442, RU 411, DU 421, CU 431, and UPF 453. The subchannelsin this paragraph mitigate interference between 1) UEs 401, IAB MT 441,and IAB MT 442, 2) UEs 402 and IAB MT 142, 3) UEs 403 and IAB MT 141,and 4) UEs 401, 402, and 403. IAB MT 441 and DU 422 communicate tomitigate interference between IAB MT 441 and UEs 402. IAB MT 442 and DU423 communicate to mitigate interference between IAB MT 442 and UEs 403.

When the performance of the midhaul link between DU 423 and CU 431falters while the midhaul link between DU 422 and CU 431 remainsadequate, DUs 422-423 switch roles. DU 422 would use the midhaul link toCU 431, and DU 423 would use IAB MT 442, the MT subchannel, RU 411, andDU 421 for midhaul. UEs 402 would communicate with external systems overthe UE subchannel, RU 412, DU 422, CU 431, and UPF 453. UEs 403 wouldcommunicate with external systems over the MT subchannel, RU 413, DU423, IAB MT 442, CU 431, and UPF 453. When the performance of themidhaul link between DU 423 and CU 431 improves while DU 422 is usingIAB MT 441, the situation reverts to the use of the UE subchannel forUEs 401 and UEs 403, and the use of the MT subchannel for IAB MT 441 andUEs 402. When the performance of the midhaul link between DU 422 and CU431 improves while DU 423 is using IAB MT 442, the situation reverts tothe use of the UE subchannel for UEs 401 and UEs 402, and the use of theMT subchannel for IAB MT 442 and UEs 403. When the performance of themidhaul links between DUs 422-423 and CU 431 improve so neither of IABMTs 441-442 are used, the situation reverts to the use of the entirefrequency channel for UEs 401-403. Additional groups of IAB MTs, DUs,RUs, and UEs could be served by IAB donor 440 in a similar manner.

FIG. 5 illustrates one of wireless UEs 401 in 5G wireless communicationnetwork 400. UE 401 comprises an example of UEs 101-103, although UEs101-103 may differ. UEs 402-403 could be similar to UE 401. UE 401comprises 5G New Radio (5GNR) radio 501, processing circuitry 502, anduser components 503. 5GNR radio 501 comprises antennas, amplifiers,filters, modulation, analog-to-digital interfaces, DSP, memory, andtransceivers that are coupled over bus circuitry. Processing circuitry502 comprises memory, CPU, user interfaces and components, andtransceivers that are coupled over bus circuitry. The memory inprocessing circuitry 502 stores an operating system, user applications(USER), and network applications for Physical Layer (PHY), Media AccessControl (MAC), Radio Link Control (RLC), Packet Data ConvergenceProtocol (PDCP), Service Data Adaption Protocol (SDAP), and RadioResource Control (RRC). The antennas in 5GNR radio 501 are wirelesslycoupled to RU 411 over a 5GNR link in the frequency channel.Transceivers (XCVRs) in 5GNR radio 501 are coupled to transceivers inprocessing circuitry 502. Transceivers in processing circuitry 502 arecoupled to user components 503 like displays, controllers, and memory.The CPU in processing circuitry 502 executes the operating system, userapplications, and network applications to exchange network signaling anduser data with RU 411 over 5GNR radio 501. In particular, the MAC in UE401 uses resource blocks in the proper channel or subchannel as directedby the MAC in DU 421—and the MACs in UEs 402-403 would also use theresource blocks in the proper channel or subchannel as directed by therespective MACs in DUs 422-423.

FIG. 6 illustrates IAB donor 440 in 5G wireless communication network400. IAB donor 440 comprises an example of wireless access node 110,although node 110 may differ. IAB donor 440 comprises RU 411, DU 421,and CU 431. RUs 412-413 could be similar to RU 411. DUs 422-423 could besimilar to DU 421. RU 411 comprises antennas, amplifiers, filters,modulation, analog-to-digital interfaces, DSP, memory, and transceiversthat are coupled over bus circuitry. DU 421 and CU 431 comprise memory,CPU, and transceivers that are coupled over bus circuitry. The memory inDU 421 stores operating systems and network applications for PHY, MAC,RLC, IP, Backhaul Adaption Protocol (BAP), F1 Application Part (F1AP),Stream Control Transmission Protocol (SCTP), User Data Protocol (UDP),and General Purpose Radio Service Transfer Protocol (GTP). The memory inCU 431 stores operating systems and network applications for F1AP, SCTP,IP, UDP, GTP, PDCP, SDAP, and RRC. The antennas in RU 411 are wirelesslycoupled to UEs 401 and IAB MTs 441-442 over 5GNR links. Transceivers inRU 411 are coupled to transceivers in DU 421 over fronthaul links likeenhanced Common Public Radio Interface (eCPRI). Transceivers in DU 421are coupled to transceivers in CU 431 over mid-haul links. Transceiversin CU 431 are coupled to AMF 451 and UPF 453 over backhaul links. TheCPU in DU 421 executes its operating system and network applications toexchange 5GNR data units with RU 411 and to exchange 5GNR data unitswith CU 431. The CPU in CU 431 executes its operating system and networkapplications to exchange the 5GNR data units with DU 421, exchange N2/N1signaling with AMF 451 and exchange N3 data with UPF 453. In particular,the F1AP in CU 431 allocates the frequency channel into a UE subchanneland MT subchannels when MTs 441-442 become active. The F1AP in CU 431directs the F1APs in DUs 421-423 to use the appropriate channels. TheF1APs in DUs 421-423 direct their MACs to use the appropriate channels.The MACs in DUs 421-423 direct their UEs 401-403 and IAB MTS 441-442 touse the appropriate channels.

FIG. 7 illustrates IAB MT 441 in the 5G wireless communication network400. IAB MT 441 comprises an example of IAB MTs 141-142, although MTs141-142 may differ. IAB MT 442 could be similar to IAB MT 441. UEs 402are attached to RU 412 which is linked to DU 422 that is coupled to IABMT 441. RU 412 comprises antennas, amplifiers, filters, modulation,analog-to-digital interfaces, DSP, memory, and transceivers that arecoupled over bus circuitry. DU 422 comprises memory, CPU, andtransceivers that are coupled over bus circuitry. The memory in DU 422stores operating systems and network applications for PHY, MAC, RLC, IP,BAP, F1AP, SCTP, UDP, and GTP. The antennas in RU 412 are wirelesslycoupled to UEs 402 over 5GNR links. Transceivers in RU 412 are coupledto transceivers in DU 422 over fronthaul links like eCPRI. Transceiversin DU 422 are coupled to transceivers in IAB MT 441 over mid-haul links.IAB MT 441 comprises node circuitry 701 and 5GNR radio 702. 5GNR radio702 comprises antennas, amplifiers, filters, modulation,analog-to-digital interfaces, DSP, memory, and transceivers that arecoupled over bus circuitry. Node circuitry 701 comprises memory, CPU,user interfaces and components, and transceivers that are coupled overbus circuitry. The memory in node circuitry 701 stores an operatingsystem, user applications (USER), and network applications for PHY, MAC,RLC, PDCP, SDAP, RRC, and BAP. The antennas in 5GNR radio 412 arewirelessly coupled to UEs 402 over 5GNR links. Transceivers in 5GNRradio 412 are coupled to transceivers in DU 422. Transceivers in DU 422are coupled to transceivers in node circuitry 701 over midhaul links.Transceivers in node circuitry 701 are coupled to transceivers in 5GNRradio 702. The antennas in 5GNR radio 702 are wirelessly coupled to RU411 over 5GNR links. The CPU in node circuitry 701 executes theoperating system and network applications to exchange network signalingand user data with DU 422 and with RU 411 over 5GNR radio 702. Inparticular, the MAC in IAB MT 441 uses resource blocks in the properchannel and subchannel as directed by the MAC in DU 421. The MACs in IABMT 441 and DU 422 communicate to mitigate interference between UEs 402and IAB MT 441.

FIG. 8 illustrates an exemplary frequency channel allocation into a UEsubchannel and IAB MT subchannels. The frequency channel allocationcould differ in other examples. A 100 Megahertz (MHz) frequency channelis shown at the top of FIG. 8. When IAB is not used, the entire 100 MHzfrequency channel is allocated to a 100 MHz UE subchannel. When thefirst IAB MT is used, the 100 MHz frequency channel is allocated into anMT subchannel of 40 MHz and UE subchannel of 60 MHz as depicted in themiddle of FIG. 8. When the first IAB MT is no longer used, the 100 MHzfrequency channel is reallocated back into the 100 MHz UE subchannel asshown at the top of FIG. 8. When the second IAB MT is used while thefirst IAB MT is still active, the 100 MHz frequency channel isreallocated into a first MT subchannel of 30 MHz, a second MT subchannelof 30 MHz, and a UE subchannel of 40 MHz as depicted at the bottom ofFIG. 8. When the second IAB MT is no longer used, the 100 MHz frequencychannel is reallocated back into the UE subchannel of 60 MHz and the IABsubchannel of 40 MHz as shown in the middle of FIG. 8. In a similarmanner, additional IAB MTs could be added and given their own MTsubchannel in the frequency channel.

FIG. 9 illustrates an exemplary control-plane operation of 5G wirelesscommunication network 400 to allocate the frequency channels amongwireless UEs 401-403 and wireless IAB MTs 441-442. The operation mayvary in other examples. The RRCs in UEs 401 attach to the RRC in CU 431over the frequency channel, RU 411, DU 421 (PHY-MAC-RLC-F1AP-SCTP-IP)and CU 431 (IP-SCTP-F1AP-PDCP). The RRCs in UEs 402 attach to the RRC inCU 431 over the frequency channel, RU 412, DU 422(PHY-MAC-RLC-F1AP-SCTP-IP) and CU 431 (IP-SCTP-F1AP-PDCP). The RRCs inUEs 403 attach to the RRC in CU 431 over the frequency channel, RU 413,DU 423 (PHY-MAC-RLC-F1AP-SCTP-IP) and CU 431 (IP-SCTP-F1AP-PDCP). TheRRC in CU 431 registers UEs 401-403 with AMF 451. The RRCs in UEs401-403, the RRC in CU 431, and AMF 451 exchange network signaling toestablish data paths. The description now proceeds to FIG. 10.

FIG. 10 illustrates an exemplary user-plane operation of 5G wirelesscommunication network 400 to allocate the frequency channels amongwireless UEs 401-403 and wireless IAB MTs 441-442. The operation mayvary in other examples. After the exchange of network signaling above toestablish the data paths, The SDAPs in UEs 401 and the SDAP in CU 431communicate over the frequency channel, RU 411, DU 421(PHY-MAC-RLC-GTP-UDP-IP), and CU 431 (IP-UDP-GTP-PDCP). The SDAPs in UEs402 and the SDAP in CU 431 communicate over the frequency channel, RU412, DU 422 (PHY-MAC-RLC-GTP-UDP-IP), and CU 431 (IP-UDP-GTP-PDCP). TheSDAPs in UEs 403 and the SDAP in CU 431 communicate over the frequencychannel, RU 413, DU 423 (PHY-MAC-RLC-GTP-UDP-IP), and CU 431(IP-UDP-GTP-PDCP). The SDAP in CU 431 and UPF 453 communicate over thebackhaul links. In this example, the midhaul link between DU 422 and CU431 initially fails.

Referring back to FIG. 9 after the first midhaul failure, the F1AP in DU422 detects the midhaul failure and requests IAB midhaul from the BAP inIAB MT 441. The BAP in IAB MT 441 connects to the BAP in DU 421 over IABMT 441 (RLC-MAC-PHY), RU 411, and DU 421 (PHY-MAC-RLC). The F1AP in inDU 422 and the F1AP in CU 431 exchange network signaling over DU 422(SCTP-IP), IAB MT 441 (BAP-RLC-MAC-PHY), RU 411, DU 421(PHY-MAC-RLC-BAP-F1AP-SCTP-IP), and CU 431 (IP-SCTP) to reestablish thedata paths for UEs 402 over the IAB link. With IAB MT 441 active, theF1AP in CU 431 allocates the frequency channel into the UE subchanneland the MT subchannel. The UE subchannel is for UEs 401 and UEs 403. TheMT subchannel is for IAB MT 441 and UEs 402. Network signaling among theF1APs indicates the subchannel assignments. The F1AP in DU 421 directsits MAC to use the UE subchannel for UEs 401 and to use the MTsubchannel for IAB MT 441. The F1AP in DU 422 directs its MAC to use theMT subchannel for UEs 402. The MAC in DU 422 and the MAC in IAB 441communicate to avoid using the same time/frequency resources for UEs 402and IAB MT 441 in the MT subchannel. The F1AP in DU 423 directs its MACto use the UE subchannel for UEs 403. The MAC in DU 421 and the MAC inDU 423 may communicate to avoid using the same time/frequency resourcesfor UEs 401 and UEs 403 in the UE subchannel.

Referring back to FIG. 10 after the exchange of network signaling, theSDAPs in UEs 401 and the SDAP in CU 431 communicate over the UEsubchannel, RU 411, DU 421 (PHY-MAC-RLC-GTP-UDP-IP), and CU 431(IP-UDP-GTP-PDCP). The SDAPs in UEs 402 and the SDAP in CU 431communicate over the IAB MT subchannel, RU 412, DU 422(PHY-MAC-RLC-GTP-UDP-IP), IAB MT (BAP-RLC-MAC-PHY), the IAB MTsubchannel, DU 421 (PHY-MAC-RLC-BAP-GTP-UDP-IP), and CU 431(IP-UDP-GTP-PDCP). The SDAPs in UEs 403 and the SDAP in CU 431communicate over the UE subchannel, RU 413, DU 423(PHY-MAC-RLC-GTP-UDP-IP), and CU 431 (IP-UDP-GTP-PDCP). The SDAPs in CU431 and UPF 453 communicate over the backhaul links. In this example,the other midhaul link between the IP components of DU 423 and CU 431now fails.

Referring back to FIG. 9 after the second midhaul failure, the F1AP inDU 423 detects the second midhaul failure and requests IAB midhaul fromthe BAP in IAB MT 442. The BAP in IAB MT 442 connects to the BAP in DU421 over IAB MT 442 (RLC-MAC-PHY), RU 411, and DU 421 (PHY-MAC-RLC). TheF1AP in DU 423 and the F1AP in CU 431 exchange network signaling over DU423 (SCTP-IP), IAB MT 442 (BAP-RLC-MAC-PHY), RU 411, DU 421(PHY-MAC-RLC-BAP-F1AP-SCTP-IP), and CU 431 (IP-SCTP) to reestablish thedata paths for UEs 403 over the second IAB link. With IAB MTs 441-442both active, the F1AP in CU 431 reallocates the frequency channel into aUE subchannel, a first MT subchannel, and a second MT subchannel. The UEsubchannel is for UEs 401. The first MT subchannel is for IAB MT 441 andUEs 402. The second MT subchannel is for IAB MT 442 and UEs 403. Thenetwork signaling among F1APs indicates the new subchannel assignments.The F1AP in DU 421 directs its MAC to use the UE subchannel for UEs 401,the first MT subchannel for IAB MT 441, and the second MT subchannel forIAB MT 442. The F1AP in DU 422 directs its MAC to use the first MTsubchannel for UEs 402. The MAC in DU 422 and the MAC in IAB 441communicate to avoid using the same time/frequency resources for UEs 402and IAB MT 441 in the first MT subchannel. The F1AP in DU 423 directsits MAC to use the second MT subchannel for UEs 403. The MAC in DU 423and the MAC in IAB 442 communicate to avoid using the sametime/frequency resources for UEs 403 and IAB MT 443 in the second MTsubchannel.

Referring back to FIG. 10 and after the exchange of network signaling,the SDAPs in UEs 401 and the SDAP in CU 431 communicate over the UEsubchannel, RU 411, DU 421 (PHY-MAC-RLC-GTP-UDP-IP), and CU 431(IP-UDP-GTP-PDCP). The SDAPs in UEs 402 and the SDAP in CU 431communicate over the first IAB MT subchannel, RU 412, DU 422(PHY-MAC-RLC-GTP-UDP-IP), IAB MT 421 (BAP-RLC-MAC-PHY), the first IAB MTsubchannel, DU 421 (PHY-MAC-RLC-BAP-GTP-UDP-IP), and CU 431(IP-UDP-GTP-PDCP). The SDAPs in UEs 403 and the SDAP in CU 431communicate over the second IAB MT subchannel, RU 413, DU 423(PHY-MAC-RLC-GTP-UDP-IP), IAB MT 422 (BAP-RLC-MAC-PHY), the second IABMT subchannel, DU 421 (PHY-MAC-RLC-BAP-GTP-UDP-IP), and CU 431(IP-UDP-GTP-PDCP). The SDAP in CU 431 and UPF 453 communicate over thebackhaul links.

When the failed midhaul links for DU 422 are restored (but not DU 423),the F1AP in DU 422 reestablishes direct midhaul to CU 431 and terminatesits IAB midhaul link. The F1AP in CU 431 reallocates the frequencychannel into the UE subchannel and the MT subchannel. The F1AP in CU 431directs the F1APs in DUs 421 and 422 to use the UE subchannel for UEs401 and 402 and directs the F1AP in DU 423 to use the MT subchannel. TheF1AP in DU 421 directs its MAC to use the UE subchannel for UEs 401 andto use the MT subchannel for IAB MT 442. The F1APs in DUs 421 and 422direct their MACs to use the UE subchannel for UEs 401 and 402. The F1APin DU 423 direct its MACs to use the MT subchannel for UEs 403. Theuser-plane operation is the same as described above for this particularchannel allocation when DU 423 uses IAB midhaul.

When the failed midhaul links for DU 423 are restored (but not DU 422),the F1AP in DU 423 reestablishes direct midhaul to CU 431 and terminatesthe IAB midhaul link. The F1AP in CU 431 reallocates the frequencychannel into the UE subchannel and the MT subchannel. The F1AP in CU 431directs the F1APs in DUs 421 and 423 to use the UE subchannel for UEs401 and 403 and directs the F1AP in DU 422 to use the MT subchannel. TheF1AP in DU 421 directs its MAC to use the UE subchannel for UEs 401 andto use the MT subchannel for IAB MT 441. The F1AP in DU 422 direct itsMACs to use the MT subchannel for UEs 402. The F1AP in DU 423 directsits MACs to use the UE subchannel for UEs 403. The user-plane operationis the same as described above for this particular channel allocationwhen DU 422 uses IAB midhaul.

When the failed midhaul links for both DU 422 and DU 423 are restored,the F1APs in DUs 422-423 reestablish direct midhaul to CU 431 andterminates their IAB midhaul links. The F1AP in CU 431 reallocates theentire frequency channel to the UE subchannel. The F1AP in CU 431directs the F1APs in DUs 421-423 to use the entire frequency channel forUEs 401-403. The F1APs in DUs 421-423 direct their MACs to use theentire frequency channel for UEs 401-403. The user-plane operation isthe same as described above for this particular channel allocation whenDUs 422-423 do not use IAB midhaul.

The wireless data network circuitry described above comprises computerhardware and software that form special-purpose wireless access nodecircuitry to serve wireless UEs and IAB MTs. The computer hardwarecomprises processing circuitry like CPUs, DSPs, GPUs, transceivers, buscircuitry, and memory. To form these computer hardware structures,semiconductors like silicon or germanium are positively and negativelydoped to form transistors. The doping comprises ions like boron orphosphorus that are embedded within the semiconductor material. Thetransistors and other electronic structures like capacitors andresistors are arranged and metallically connected within thesemiconductor to form devices like logic circuitry and storageregisters. The logic circuitry and storage registers are arranged toform larger structures like control units, logic units, andRandom-Access Memory (RAM). In turn, the control units, logic units, andRAM are metallically connected to form CPUs, DSPs, GPUs, transceivers,bus circuitry, and memory.

In the computer hardware, the control units drive data between the RAMand the logic units, and the logic units operate on the data. Thecontrol units also drive interactions with external memory like flashdrives, disk drives, and the like. The computer hardware executesmachine-level software to control and move data by driving machine-levelinputs like voltages and currents to the control units, logic units, andRAM. The machine-level software is typically compiled from higher-levelsoftware programs. The higher-level software programs comprise operatingsystems, utilities, user applications, and the like. Both thehigher-level software programs and their compiled machine-level softwareare stored in memory and retrieved for compilation and execution. Onpower-up, the computer hardware automatically executesphysically-embedded machine-level software that drives the compilationand execution of the other computer software components which thenassert control. Due to this automated execution, the presence of thehigher-level software in memory physically changes the structure of thecomputer hardware machines into special-purpose wireless access nodecircuitry to serve wireless UEs and IAB MTs.

The above description and associated figures teach the best mode of theinvention. The following claims specify the scope of the invention. Notethat some aspects of the best mode may not fall within the scope of theinvention as specified by the claims. Those skilled in the art willappreciate that the features described above can be combined in variousways to form multiple variations of the invention. Thus, the inventionis not limited to the specific embodiments described above, but only bythe following claims and their equivalents.

What is claimed is:
 1. A method of operating a wireless access node that serves wireless User Equipment (UEs) and wireless Integrated Access and Backhaul Mobile Terminations (IAB MTs), the method comprising: a radio wirelessly exchanging first access communications with the wireless UEs over a frequency channel and wirelessly receiving a first IAB request from a first one of the wireless IAB MTs; a controller allocating the frequency channel into a UE subchannel and an MT subchannel responsive to the first IAB request; the radio wirelessly exchanging second access communications with the wireless UEs over the UE subchannel, wirelessly exchanging first backhaul communications with the first wireless IAB MT over the MT subchannel, and wirelessly receiving a second IAB request from a second one of the wireless IAB MTs; the controller reallocating the frequency channel into a new UE subchannel, a first MT subchannel, and a second MT subchannel responsive to the second IAB request; and the radio wirelessly exchanging third access communications with the wireless UEs over the new UE subchannel, wirelessly exchanging second backhaul communications with the first wireless IAB MT over the first MT subchannel, and wirelessly exchanging third backhaul communications with the second wireless IAB MT over the second MT subchannel.
 2. The method of claim 1 further comprising: the controller generating signaling that indicates the MT subchannel; the radio wirelessly transferring the signaling that indicates the MT subchannel to the first wireless IAB MT; the controller generating additional signaling that indicates the first MT subchannel and the second IAB channel; the radio wirelessly transferring the additional signaling that indicates the first MT subchannel to the first wireless IAB MT and wirelessly transferring the additional signaling that indicates the second MT subchannel to the second wireless IAB MT.
 3. The method of claim 1 further comprising: the radio wirelessly receiving an IAB deregistration from the first wireless IAB MT; the controller reallocating the frequency channel into another new UE subchannel and a new MT subchannel responsive to the IAB deregistration; and the radio wirelessly exchanging fourth access communications with the wireless UEs over the other new UE subchannel and wirelessly exchanging fourth backhaul communications with the second wireless IAB MT over the new MT subchannel.
 4. The method of claim 1 further comprising: the radio wirelessly receiving an IAB deregistration from the first wireless IAB MT; the controller reallocating the frequency channel into another new UE subchannel and a new MT subchannel responsive to the IAB deregistration; and the controller generating signaling that indicates the new MT subchannel; the radio wirelessly transferring the signaling that indicates the new MT subchannel to the second wireless IAB MT.
 5. The method of claim 1 further comprising: the radio wirelessly receiving an IAB deregistration from the second wireless IAB MT; the controller reallocating the frequency channel into another new UE subchannel and a new MT subchannel responsive to the IAB deregistration; and the radio wirelessly exchanging fourth access communications with the wireless UEs over the other new UE subchannel and wirelessly exchanging fourth backhaul communications with the first wireless IAB MT over the new MT subchannel.
 6. The method of claim 1 further comprising: the radio wirelessly receiving an IAB deregistration from the second wireless IAB MT; the controller reallocating the frequency channel into another new UE subchannel and a new MT subchannel responsive to the IAB deregistration; the controller generating signaling that indicates the new MT subchannel; and the radio wirelessly transferring the signaling that indicates the new MT subchannel to the first wireless IAB MT.
 7. The method of claim 1 wherein the controller comprises an F1 Application Part (F1AP) in an IAB donor Centralized Unit (CU).
 8. The method of claim 1 wherein the controller allocating the frequency channel into the UE subchannel and the MT subchannel responsive to the first IAB request comprises an F1 Application Part (F1AP) in an IAB donor Centralized Unit (CU) detecting the first wireless IAB MT, and in response, allocating the frequency channel into the UE subchannel and the MT subchannel, indicating the UE subchannel and the MT subchannel to another F1AP in an IAB donor Distributed Unit (DU), and indicating the MT subchannel to a different F1AP in a DU that is served by the first IAB MT.
 9. The method of claim 1 wherein the controller allocating the frequency channel into the UE subchannel and the MT subchannel responsive to the first IAB request comprises: an F1 Application Part (F1AP) in an IAB donor Distributed Unit (DU) receiving an indication of the UE subchannel and the MT subchannel, and in response, directing a Media Access Control (MAC) in the IAB donor DU to use the UE subchannel for first User Equipment (UEs) directly served by the IAB donor and to use the MT subchannel for the first IAB MT; and another F1AP in another DU that is served over the first IAB MT receiving another indication of the MT subchannel, and in response, directing another MAC in the other DU that is served over the first IAB MT to use the MT subchannel for second UEs that are directly served by the other DU over the first IAB MT.
 10. The method of claim 1 wherein the radio wirelessly exchanging the access communications and the backhaul communications comprises wirelessly exchanging wireless Fifth Generation New Radio (5GNR) signals.
 11. A wireless access node to serve wireless User Equipment (UEs) and wireless Integrated Access and Backhaul Mobile Terminations (IAB MTs), the wireless access node comprising: a radio configured to wirelessly exchange first access communications with the wireless UEs over a frequency channel and wirelessly receive a first IAB request from a first one of the wireless IAB MTs; a controller configured to allocate the frequency channel into a UE subchannel and an MT subchannel responsive to the first IAB request; the radio configured to wirelessly exchange second access communications with the wireless UEs over the UE subchannel, wirelessly exchange first backhaul communications with the first wireless IAB MT over the MT subchannel, and wirelessly receive a second IAB request from a second one of the wireless IAB MTs; the controller configured to reallocate the frequency channel into a new UE subchannel, a first MT subchannel, and a second MT subchannel responsive to the second IAB request; and the radio configured to wirelessly exchange third access communications with the wireless UEs over the new UE subchannel, wirelessly exchange second backhaul communications with the first wireless IAB MT over the first MT subchannel, and wirelessly exchange third backhaul communications with the second wireless IAB MT over the second MT subchannel.
 12. The wireless access node of claim 11 further comprising: the controller configured to generate signaling that indicates the MT subchannel; the radio configured to wirelessly transfer the signaling that indicates the MT subchannel to the first wireless IAB MT; the controller configured to generate additional signaling that indicates the first MT subchannel and the second IAB channel; the radio configured to wirelessly transfer the additional signaling that indicates the first MT subchannel to the first wireless IAB MT and wirelessly transfer the additional signaling that indicates the second MT subchannel to the second wireless IAB MT.
 13. The wireless access node of claim 11 further comprising: the radio configured to wirelessly receive an IAB deregistration from the first wireless IAB MT; the controller configured to reallocate the frequency channel into another new UE subchannel and a new MT subchannel responsive to the IAB deregistration; and the radio configured to wirelessly exchange fourth access communications with the wireless UEs over the other new UE subchannel and wirelessly exchange fourth backhaul communications with the second wireless IAB MT over the new MT subchannel.
 14. The wireless access node of claim 11 further comprising: the radio configured to wirelessly receive an IAB deregistration from the first wireless IAB MT; the controller configured to reallocate the frequency channel into another new UE subchannel and a new MT subchannel responsive to the IAB deregistration; and the controller configured to generate signaling that indicates the new MT subchannel; the radio configured to wirelessly transfer the signaling that indicates the new MT subchannel to the second wireless IAB MT.
 15. The wireless access node of claim 11 further comprising: the radio configured to wirelessly receive an IAB deregistration from the second wireless IAB MT; the controller configured to reallocate the frequency channel into another new UE subchannel and a new MT subchannel responsive to the IAB deregistration; and the radio configured to wirelessly exchange fourth access communications with the wireless UEs over the other new UE subchannel and wirelessly exchange fourth backhaul communications with the first wireless IAB MT over the new MT subchannel.
 16. The wireless access node of claim 11 further comprising: the radio configured to wirelessly receive an IAB deregistration from the second wireless IAB MT; the controller configured to reallocate the frequency channel into another new UE subchannel and a new MT subchannel responsive to the IAB deregistration; the controller configured to generate signaling that indicates the new MT subchannel; and the radio configured to wirelessly transfer the signaling that indicates the new MT subchannel to the first wireless IAB MT.
 17. The wireless access node of claim 11 wherein the controller comprises an F1 Application Part (F1AP) in an IAB donor Centralized Unit (CU).
 18. The wireless access node of claim 11 wherein the controller comprises an F1 Application Part (F1AP) in an IAB donor Centralized Unit (CU) configured to detect the first wireless IAB MT, and in response, allocate the frequency channel into the UE subchannel and the MT subchannel, indicate the UE subchannel and the MT subchannel to another F1AP in an IAB donor Distributed Unit (DU), and indicate the MT subchannel to a different F1AP in another DU that is served by the first IAB MT.
 19. The wireless access node of claim 11 wherein the controller comprises: an F1 Application Part (F1AP) in an IAB donor Distributed Unit (DU) configured to receive an indication of the UE subchannel and the MT subchannel, and in response, direct a Media Access Control (MAC) in the IAB donor DU to use the UE subchannel for first User Equipment (UEs) directly served by the IAB donor and to use the MT subchannel for the first IAB MT; and another F1AP in another DU that is served over the first IAB MT configured to receive another indication of the MT subchannel, and in response, direct another MAC in the other DU that is served over the first IAB MT to use the MT subchannel for second UEs that are directly served by the other DU over the first IAB MT.
 20. The wireless access node of claim 11 wherein the radio is configured to wirelessly exchange wireless Fifth Generation New Radio (5GNR) signals. 